CN115353345A - Recycled aggregate cement concrete and preparation method thereof - Google Patents
Recycled aggregate cement concrete and preparation method thereof Download PDFInfo
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- CN115353345A CN115353345A CN202210975740.1A CN202210975740A CN115353345A CN 115353345 A CN115353345 A CN 115353345A CN 202210975740 A CN202210975740 A CN 202210975740A CN 115353345 A CN115353345 A CN 115353345A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a recycled aggregate cement concrete and a preparation method thereof, which solves the problems of poor mechanical property, complex processing procedure of recycled aggregate and high processing cost of the recycled aggregate cement concrete in the recycled aggregate pretreatment technology, and the recycled aggregate cement concrete comprises recycled aggregate, cement, water and cement mortar (5); the recycled aggregate cement concrete for one cubic meter is prepared from the recycled aggregate 1191.9kg in mass, cement 80-120 kg in mass, water 32-48 kg in mass and cement mortar 1156.95kg in mass (5); the cement mortar (5) required for preparing one cubic meter of recycled aggregate cement concrete comprises 595.95kg of natural sand, 400kg of cement, 1kg of polycarboxylic acid water reducing agent and 160kg of water. The invention also provides a preparation method of the recycled aggregate cement concrete.
Description
Technical Field
The invention relates to a method for treating cement concrete recycled aggregate, in particular to recycled aggregate cement concrete and a preparation method thereof.
Background
The recycled cement concrete aggregate can be recycled, so that the waste of resources can be avoided, and the environment can be protected. However, the surface of the recycled aggregate has old cement mortar and microcracks, so that the compactness of the aggregate is reduced, the water absorption of the aggregate is increased, and the performance of the aggregate is negatively influenced. Therefore, the recycled aggregate needs to be pretreated, and the physical property of the recycled aggregate is improved, so that the mechanical property of the recycled aggregate cement concrete is improved.
The existing method for improving the mechanical property of recycled aggregate cement concrete mainly comprises the following steps:
recycled aggregate pre-wet method
Putting the recycled aggregate into water for pre-wetting treatment before mixing, so that the recycled aggregate is saturated with water in advance, and then mixing;
regenerated aggregate slurry coating method
Coating a layer of cement mortar on the surface of the recycled aggregate, and curing the recycled aggregate coated with the cement mortar for a certain age, wherein the recycled aggregate is prevented from being directly contacted during curing, and the recycled aggregate is mixed after curing;
method for treating recycled aggregate with chemical reagent
Treating the surface of the recycled aggregate by using a chemical reagent to remove old mortar on the surface of the aggregate, and then mixing;
method for replacing recycled aggregate with partial natural aggregate
Replacing part of recycled aggregate by natural aggregate, and then mixing;
the disadvantages of the related art are mainly as follows:
the recycled aggregate is treated by a pre-wet method, water can enter gaps of the recycled aggregate, and in the process of concrete mixing, the water in the recycled aggregate can return to cement mortar, so that the water cement ratio of the concrete is increased, and the mechanical property of the concrete is reduced; in addition, the pre-wet method treatment does not play a role in reinforcing the surface of the recycled aggregate and filling gaps on the surface of the recycled aggregate;
the recycled aggregate is treated by a recycled aggregate wrapping method, so that the recycled aggregate is required to be prevented from being directly contacted after wrapping, and the curing is required for a certain time, so that the process is complicated, and the quantitative production and the actual construction are not facilitated;
the surface of the recycled aggregate is treated by using a recycled aggregate chemical reagent treatment method, so that the engineering cost is increased, and the post-treatment of the chemical reagent also has certain influence on the environment;
the method of replacing recycled aggregate with partial natural aggregate reduces the utilization rate of the recycled aggregate, and the mechanical property of the recycled aggregate cement concrete is not improved obviously enough.
Disclosure of Invention
The invention aims to solve the technical problems of poor mechanical property of recycled aggregate cement concrete, complex treatment process of recycled aggregate and high treatment cost in the existing recycled aggregate pretreatment technology, and provides a mixing method for improving the mechanical property of recycled aggregate cement concrete.
In order to solve the technical problems, the invention adopts the following technical scheme:
the recycled aggregate cement concrete comprises recycled aggregate, cement, water and cement mortar;
the recycled aggregate cement concrete of one cubic meter comprises the recycled aggregate of 1191.9kg, cement of 80-120 kg, water of 32-48 kg and cement mortar of 1156.95kg (5); the cement mortar (5) required for preparing one cubic meter of recycled aggregate cement concrete comprises 595.95kg of natural sand, 400kg of cement, 1kg of polycarboxylic acid water reducing agent and 160kg of water.
The preparation method of the recycled aggregate cement concrete comprises the following steps:
1) Preparing materials;
2) Uniformly mixing the recycled aggregate:
handle according to 1m 3 The recycled aggregate cement concrete contains 1911.9kg recycled aggregate which is prepared according to the mass proportion in the material preparation step and dried, and the recycled aggregate is placed into a horizontal concrete stirrer and stirred for 2min at the rotating speed of 45r/min until the recycled aggregate and the cement concrete are uniformly mixed;
3) Pretreating recycled aggregate;
4) Preparing cement mortar;
5) Preparing recycled aggregate cement concrete:
and pouring the treated recycled aggregate into a concrete stirrer filled with the prepared cement mortar, and fully stirring at the rotating speed of 45r/min for 4min until all components are uniformly distributed to prepare the recycled aggregate cement concrete.
The preparation steps in the technical scheme are as follows:
(1) Placing a 19mm standard sieve, a 16mm standard sieve, a 9.5mm standard sieve and a 4.75mm standard sieve from top to bottom to form a sieving tool, pouring the recycled aggregate into the 19mm standard sieve, placing the sieving tool on a vibrating sieve machine, starting the vibrating sieve machine to sieve the recycled aggregate to obtain the recycled aggregate with the particle size ranges of 4.75-9.5 mm, 9.5-16 mm and 16-19 mm;
(2) Placing 20 mass percent of recycled aggregate with the particle size of 4.75-9.5 mm, 60 mass percent of recycled aggregate with the particle size of 9.5-16 mm and 20 mass percent of recycled aggregate with the particle size of 16-19 mm into a 101-5B type electrothermal blowing drying oven, and drying for 1h at the temperature of 100 +/-5 ℃;
(3) And (3) putting the natural sand into a 101-5B type electric heating air blast drying box, and drying for 1h at the temperature of 100 +/-5 ℃.
The method for pretreating recycled aggregate in the technical scheme comprises the following steps:
(1) Handle according to 1m 3 Adding 180-120 kg of cement contained in the recycled aggregate cement concrete into a concrete stirrer filled with uniformly mixed recycled aggregate;
(2) Starting a stirrer to stir the mixture of the recycled aggregate and the cement at a rotating speed of 45r/min for 2min until the recycled aggregate and the cement are uniformly mixed;
(3) Handle according to 1m 3 Adding 32-48 kg of water contained in the recycled aggregate cement concrete into a concrete stirrer filled with a uniform mixture of recycled aggregate and cement;
(4) And starting a stirrer to stir the mixture of the recycled aggregate, the cement and the water at a rotating speed of 45r/min for 4min until the surface of the recycled aggregate is uniformly covered by cement paste, thereby obtaining the treated recycled aggregate.
The steps for preparing cement mortar in the technical scheme are as follows:
(1) While the recycled aggregate is pretreated, the recycled aggregate is put into another horizontal concrete mixer according to the proportion of 1m 3 595.95kg natural sand and 1m as raw material are added into the regenerated aggregate cement concrete 3 Adding 400kg of cement into the recycled aggregate cement concrete;
(2) Starting a stirrer to stir at a rotating speed of 45r/min for 2min, and uniformly stirring the mixture of the natural sand and the cement;
(3) Will be in accordance with 1m 3 The recycled aggregate cement concrete contains 1kg of polycarboxylic acid water reducing agent and 1m 3 Pouring 160kg of water in the recycled aggregate cement concrete into a plastic container, stirring for 1min by using a glass rod until the water is uniformly mixed, and adding the polycarboxylic acid water reducing agent and the water mixture into a concrete stirrer filled with the uniform mixture of the natural sand and the cement;
(4) And starting a stirrer to stir at a rotating speed of 45r/min for 2min to prepare cement mortar.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the mixing method for improving the mechanical property of the recycled aggregate cement concrete, the mixing method has the advantages that the cement concrete recycled aggregate is pretreated, microcracks and pores on the surface of the aggregate are filled, the adhesion between the aggregate and the old mortar is reinforced, and the compressive strength of the recycled aggregate cement concrete can be effectively improved;
2. compared with the recycled aggregate slurry wrapping method, the mixing method for improving the mechanical property of the recycled aggregate cement concrete can effectively save the pretreatment time of the recycled aggregate, simplify the pretreatment process and be easier to implement and apply in practical engineering;
3. compared with the recycled aggregate chemical reagent treatment method, the mixing method for improving the mechanical property of the recycled aggregate cement concrete can effectively save the engineering cost and avoid the environmental problem caused by the subsequent chemical reagent treatment;
4. compared with the method of replacing partial natural aggregate with the recycled aggregate, the mixing method for improving the mechanical property of the recycled aggregate cement concrete can improve the utilization rate of the recycled aggregate and improve the compressive strength of the recycled aggregate cement concrete.
Drawings
The invention is further described with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of a method for preparing recycled aggregate cement concrete according to the present invention;
FIG. 2 is a block diagram showing the flow of the material preparation step in the method for producing recycled aggregate cement concrete according to the present invention;
FIG. 3 is a block flow diagram of the step of pretreating recycled aggregate in the method for preparing recycled aggregate cement concrete according to the present invention;
FIG. 4 is a block diagram showing the flow of the step of preparing cement mortar in the method for preparing recycled aggregate cement concrete according to the present invention;
FIG. 5 is a schematic diagram of a recycled aggregate of cement concrete used in a method for preparing recycled aggregate cement concrete according to the present invention;
FIG. 6 is a structural view of a recycled cement concrete aggregate used in a method for producing recycled aggregate cement concrete according to the present invention;
FIG. 7 is a structural view of treated cement concrete recycled aggregate in the method for preparing recycled aggregate cement concrete according to the present invention;
FIG. 8 is a drawing of a treated recycled aggregate of cement concrete in the method for preparing recycled aggregate cement concrete according to the present invention;
FIG. 9 is a structural view of a recycled aggregate cement concrete after mixing in a method for preparing a recycled aggregate cement concrete according to the present invention;
in the figure: 1. old mortar, 2. Microcrack, 3. Cement paste, 4. Treated recycled aggregate, and 5. Cement mortar.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
referring to fig. 5 and 6, it can be seen that part of the surface of the recycled aggregate is covered by the used mortar 1, and mechanical crushing causes a plurality of micro-cracks 2 on the surface of the recycled aggregate, and the surface of the aggregate has more pores, resulting in poor performance of the recycled aggregate.
Referring to fig. 7, 8 and 9, by pretreating the recycled aggregate, the pores and microcracks 2 on the surface of the recycled aggregate are filled with the cement slurry 3, and the cement slurry 3 wraps the recycled aggregate, so that the connection between the old mortar 1 and the recycled aggregate is reinforced, the direct contact between the old mortar 1 and the cement mortar 5 in the mixing process is avoided, and the performance of the recycled aggregate cement concrete is improved.
The recycled aggregate cement concrete comprises recycled aggregate, cement, water and cement mortar 5;
the recycled aggregate cement concrete of one cubic meter comprises the recycled aggregate of 1191.9kg in mass, ordinary Portland cement of 80-120 kg in mass and 42.5MPa in strength grade, water of 32-48 kg in mass and cement mortar 5 of 1156.95kg in mass; wherein the cement mortar 5 required for manufacturing one cubic meter of recycled aggregate cement concrete comprises 595.95kg of natural sand, 400kg of ordinary Portland cement with the strength grade of 42.5MPa, 1kg of polycarboxylic acid water reducing agent and 160kg of water;
referring to fig. 1, the preparation method of the recycled aggregate cement concrete comprises the following steps:
1. stock preparation
Referring to fig. 2, the preparation steps are as follows:
(1) Placing a 19mm standard sieve, a 16mm standard sieve, a 9.5mm standard sieve and a 4.75mm standard sieve from top to bottom to form a sieving tool, pouring the recycled aggregate into the 19mm standard sieve, placing the sieving tool on a vibrating sieving machine, and starting the vibrating sieving machine to sieve the recycled aggregate to obtain recycled aggregate with the particle size ranges of 4.75-9.5 mm, 9.5-16 mm and 16-19 mm;
(2) Placing 20 mass percent of recycled aggregate with the particle size of 4.75-9.5 mm, 60 mass percent of recycled aggregate with the particle size of 9.5-16 mm and 20 mass percent of recycled aggregate with the particle size of 16-19 mm into a 101-5B type electrothermal blowing dry box, and drying for 1h at the temperature of 100 +/-5 ℃;
(3) Putting the natural sand into a 101-5B type electric heating air blast drying box, and drying for 1h at the temperature of 100 +/-5 ℃;
2. uniformly mixing recycled aggregate
Handle according to 1m 3 The recycled aggregate cement concrete contains 1911.9kg recycled aggregate which is prepared according to the mass proportion in the material preparation step and dried, and the recycled aggregate is placed into a horizontal concrete stirrer and stirred for 2min at the rotating speed of 45r/min until the recycled aggregate and the cement concrete are uniformly mixed;
3. pretreating recycled aggregate
Referring to fig. 3, the procedure for pre-treating recycled aggregate is as follows:
(1) Handle according to 1m 3 Adding 180-120 kg of cement contained in the recycled aggregate cement concrete into a concrete stirrer filled with uniformly mixed recycled aggregate;
(2) Starting a stirrer to stir the mixture of the recycled aggregate and the cement at a rotating speed of 45r/min for 2min until the recycled aggregate and the cement are uniformly mixed;
(3) Handle according to 1m 3 Adding 32-48 kg of water contained in the recycled aggregate cement concrete into a concrete stirrer filled with a uniform mixture of recycled aggregate and cement;
(4) Referring to fig. 7 and 8, a stirrer is started to stir the mixture of the recycled aggregate, the cement and the water at a rotating speed of 45r/min for 4min until the surface of the recycled aggregate is uniformly covered by the cement slurry 3, so that the processed recycled aggregate 4 is obtained;
4. preparation of Cement mortar
Referring to fig. 4, the cement mortar is prepared as follows:
(1) While the recycled aggregate is pretreated, the recycled aggregate is fed into another horizontal concrete mixer according to the proportion of 1m 3 595.95kg natural sand and 1m of the natural sand are added into the recycled aggregate cement concrete 3 Adding 400kg of cement into the recycled aggregate cement concrete;
(2) Starting a stirrer to stir at a rotating speed of 45r/min for 2min, and uniformly stirring the mixture of the natural sand and the cement;
(3) Will be in accordance with 1m 3 The recycled aggregate cement concrete contains 1kg of polycarboxylic acid water reducing agent and 1m 3 The recycled aggregate cement concrete containing 160kg of water is poured into a plastic container and stirred for 1min by a glass rodUniformly mixing, adding the polycarboxylate superplasticizer and the water mixture into a concrete stirrer filled with the uniform mixture of the natural sand and the cement;
(4) Starting a stirrer to stir for 2min at a rotating speed of 45r/min to prepare cement mortar 5;
5. preparation of recycled aggregate cement concrete
Referring to fig. 9, the preparation of recycled aggregate cement concrete is as follows:
pouring the treated recycled aggregate 4 into a concrete stirrer filled with prepared cement mortar 5, and fully stirring for 4min at the rotating speed of 45r/min until all components are uniformly distributed to prepare the recycled aggregate cement concrete.
Example 1 preparation of 0.0066m 3 Recycled aggregate cement concrete
1. Stock preparation
The preparation method comprises the following steps:
(1) Placing a 19mm standard sieve, a 16mm standard sieve, a 9.5mm standard sieve and a 4.75mm standard sieve from top to bottom to form a sieving tool, pouring the recycled aggregate into the 19mm standard sieve, placing the sieving tool on a vibrating sieve machine, starting the vibrating sieve machine to sieve the recycled aggregate to obtain 1.58kg of recycled aggregate with the particle size of 4.75-9.5 mm, 4.74kg of recycled aggregate with the particle size of 9.5-16 mm and 1.58kg of recycled aggregate with the particle size of 16-19 mm;
(2) 1.58kg of recycled aggregate with the grain diameter of 4.75-9.5 mm, 4.74kg of recycled aggregate with the grain diameter of 9.5-16 mm and 1.58kg of recycled aggregate with the grain diameter of 16-19 mm are put into an electrothermal blowing drying box and dried for 1 hour at the temperature of 100 ℃;
(3) Putting 3.933kg of natural sand into an electric heating forced air drying oven, and drying for 1h at 100 ℃;
2. uniformly mixing recycled aggregate
Putting 7.9kg of recycled aggregate into a concrete stirrer, and stirring at the rotating speed of 45r/min for 2min until the recycled aggregate is uniformly mixed;
3. pretreating recycled aggregate
The steps for pretreating recycled aggregate are as follows:
(1) Adding 0.528kg of cement into a concrete mixer filled with uniformly mixed recycled aggregate;
(2) Starting a stirrer to stir the mixture of the recycled aggregate and the cement at a rotating speed of 45r/min for 2min until the mixture is uniformly mixed;
(3) Adding 0.211kg of water into a concrete mixer filled with a uniform mixture of recycled aggregate and cement;
(4) Starting a stirrer to stir the mixture of the recycled aggregate, the cement and the water at a rotating speed of 45r/min for 4min until the surface of the recycled aggregate is uniformly covered by the cement paste 3 to obtain a treated recycled aggregate 4;
4. preparation of Cement mortar
The cement mortar preparation steps are as follows:
(1) While the recycled aggregate is pretreated, 3.933kg of natural sand and 2.640kg of cement are added into the other horizontal concrete mixer;
(2) Starting a stirrer to stir at a rotating speed of 45r/min for 2min, and stirring the mixture of the natural sand and the cement uniformly;
(3) Pouring 0.0264kg of polycarboxylate superplasticizer and 1.056kg of water into a plastic container, stirring for 1min by using a glass rod until the materials are uniformly mixed, and adding the polycarboxylate superplasticizer and water mixture into a concrete stirrer filled with a uniform mixture of natural sand and cement;
(4) Starting a stirrer to stir at a rotating speed of 45r/min for 2min to prepare cement mortar 5;
5. preparation of recycled aggregate cement concrete
Pouring the pretreated recycled aggregate 4 into a concrete stirrer filled with prepared cement mortar 5, and fully stirring at the rotating speed of 45r/min for 4min until all components are uniformly distributed to prepare the recycled aggregate cement concrete.
Example 2 preparation of 0.0066m 3 Recycled aggregate cement concrete
1. Stock preparation
The preparation method comprises the following steps:
(1) Placing a 19mm standard sieve, a 16mm standard sieve, a 9.5mm standard sieve and a 4.75mm standard sieve from top to bottom to form a sieving tool, pouring the recycled aggregate into the 19mm standard sieve, placing the sieving tool on a vibrating sieve machine, starting the vibrating sieve machine to sieve the recycled aggregate to obtain 1.58kg of recycled aggregate with the particle size of 4.75-9.5 mm, 4.74kg of recycled aggregate with the particle size of 9.5-16 mm and 1.58kg of recycled aggregate with the particle size of 16-19 mm;
(2) 1.58kg of recycled aggregate with the particle size of 4.75-9.5 mm, 4.74kg of recycled aggregate with the particle size of 9.5-16 mm and 1.58kg of recycled aggregate with the particle size of 16-19 mm are put into a 101-5B type electrothermal blowing drying oven and dried for 1h at the temperature of 100 ℃;
(3) Putting 3.933kg of natural sand into a 101-5B type electrothermal blowing drying oven, and drying for 1h at 100 ℃;
2. uniformly mixing recycled aggregate
Putting 7.9kg of recycled aggregate into a concrete stirrer, and stirring at the rotating speed of 45r/min for 2min until the recycled aggregate is uniformly mixed;
3. pretreating recycled aggregate
The steps for pretreating recycled aggregate are as follows:
(1) Adding 0.66kg of cement into a concrete mixer filled with uniformly mixed recycled aggregate;
(2) Starting a stirrer to stir the mixture of the recycled aggregate and the cement at the rotating speed of 45r/min for 2min until the recycled aggregate and the cement are uniformly mixed;
(3) Adding 0.264kg of water into a concrete stirrer filled with a uniform mixture of recycled aggregate and cement;
(4) Starting a stirrer to stir the mixture of the recycled aggregate, the cement and the water at a rotating speed of 45r/min for 4min until the surface of the recycled aggregate is uniformly covered by the cement paste 3 to obtain a treated recycled aggregate 4;
4. preparation of Cement mortar
The cement mortar preparation steps are as follows:
(1) While the recycled aggregate is pretreated, 3.933kg of natural sand and 2.64kg of cement are added into the other horizontal concrete mixer;
(2) Starting a stirrer to stir at a rotating speed of 45r/min for 2min, and stirring the mixture of the natural sand and the cement uniformly;
(3) Pouring 0.0264kg of polycarboxylic acid high-efficiency water reducer and 1.056kg of water into a plastic container, stirring for 1min by using a glass rod until the materials are uniformly mixed, and adding the polycarboxylic acid water reducer and the water mixture into a concrete stirrer filled with a uniform mixture of natural sand and cement;
(4) Starting a stirrer to stir at a rotating speed of 45r/min for 2min to prepare cement mortar 5;
5. preparation of recycled aggregate cement concrete
Pouring the pretreated recycled aggregate 4 into a concrete stirrer filled with prepared cement mortar 5, and fully stirring at the rotating speed of 45r/min for 4min until all components are uniformly distributed to prepare the recycled aggregate cement concrete.
Example 3 preparation of 0.0066m 3 Recycled aggregate cement concrete
1. Stock preparation
The preparation method comprises the following steps:
(1) Placing a 19mm standard sieve, a 16mm standard sieve, a 9.5mm standard sieve and a 4.75mm standard sieve from top to bottom to form a sieving tool, pouring the recycled aggregate into the 19mm standard sieve, placing the sieving tool on a vibrating sieve machine, starting the vibrating sieve machine to sieve the recycled aggregate to obtain 1.58kg of recycled aggregate with the particle size of 4.75-9.5 mm, 4.74kg of recycled aggregate with the particle size of 9.5-16 mm and 1.58kg of recycled aggregate with the particle size of 16-19 mm;
(2) 1.58kg of recycled aggregate with the particle size of 4.75-9.5 mm, 4.74kg of recycled aggregate with the particle size of 9.5-16 mm and 1.58kg of recycled aggregate with the particle size of 16-19 mm are put into a 101-5B type electrothermal blowing drying oven and dried for 1h at the temperature of 100 ℃;
(3) Putting 3.933kg of natural sand into a 101-5B type electrothermal blowing drying oven, and drying for 1h at 100 ℃;
2. uniformly mixing recycled aggregate
Putting 7.9kg of recycled aggregate into a concrete stirrer, and stirring at the rotating speed of 45r/min for 2min until the recycled aggregate is uniformly mixed;
3. pretreating recycled aggregate
The steps for pretreating recycled aggregate are as follows:
(1) Adding 0.792kg of cement into a concrete mixer filled with uniformly mixed recycled aggregate;
(2) Starting a stirrer to stir the mixture of the recycled aggregate and the cement at a rotating speed of 45r/min for 2min until the mixture is uniformly mixed;
(3) 0.3168kg water is added into a concrete mixer filled with the uniform mixture of recycled aggregate and cement;
(4) Starting a stirrer to stir the mixture of the recycled aggregate, the cement and the water at a rotating speed of 45r/min for 4min until the surface of the recycled aggregate is uniformly covered by the cement paste 3 to obtain a treated recycled aggregate 4;
4. preparation of Cement mortar
The cement mortar preparation steps are as follows:
(1) While the recycled aggregate is pretreated, 3.933kg of natural sand and 2.64kg of cement are added into the other concrete mixer;
(2) Starting a stirrer to stir at a rotating speed of 45r/min for 2min, and stirring the mixture of the natural sand and the cement uniformly;
(3) Pouring 0.0264kg of polycarboxylic acid water reducer and 1.056kg of water into a plastic container, stirring with a glass rod for 1min until uniformly mixed, adding the polycarboxylic acid water reducer and water mixture into a concrete stirrer filled with a uniform mixture of natural sand and cement;
(4) Starting a stirrer to stir at a rotating speed of 45r/min for 2min to prepare cement mortar 5;
5. preparation of recycled aggregate cement concrete
Pouring the pretreated recycled aggregate 4 into a concrete stirrer filled with prepared cement mortar 5, and fully stirring at the rotating speed of 45r/min for 4min until all components are uniformly distributed to prepare the recycled aggregate cement concrete.
The recycled aggregate cement concrete prepared above was prepared into a cubic test piece of recycled aggregate concrete of 100cm × 100cm × 100cm, and a compressive strength test was performed.
| Recycled aggregate cement concrete | Concrete 28d compressive strength/MPa |
| Example 1 | 41.6 |
| Example 2 | 46.3 |
| Example 3 | 42.9 |
| Pre-wet treatment recycled aggregate cement concrete | 36.6 |
| Cement concrete with 30% natural aggregate replacing regenerated aggregate | 38.0 |
| Cement concrete with 15% natural aggregate replacing recycled aggregate | 31.2 |
Claims (5)
1. The recycled aggregate cement concrete is characterized by comprising recycled aggregate, cement, water and cement mortar (5);
the recycled aggregate cement concrete of one cubic meter comprises the recycled aggregate of 1191.9kg, cement of 80-120 kg, water of 32-48 kg and cement mortar of 1156.95kg (5); the cement mortar (5) required for manufacturing one cubic meter of recycled aggregate cement concrete comprises 595.95kg of natural sand, 400kg of cement, 1kg of polycarboxylic acid water reducing agent and 160kg of water.
2. The preparation method of the recycled aggregate cement concrete is characterized by comprising the following steps of:
1) Preparing materials;
2) Uniformly mixing the recycled aggregate:
handle according to 1m 3 The recycled aggregate cement concrete contains 1911.9kg recycled aggregate which is prepared according to the mass proportion in the material preparation step and is dried, the recycled aggregate is placed into a horizontal concrete stirrer, and the recycled aggregate cement concrete is stirred for 2min at the rotating speed of 45r/min until the recycled aggregate and the concrete are uniformly mixed;
3) Pretreating recycled aggregate;
4) Preparing cement mortar;
5) Preparing recycled aggregate cement concrete:
pouring the treated recycled aggregate (4) into a concrete stirrer filled with the prepared cement mortar (5), and fully stirring for 4min at the rotating speed of 45r/min until all components are uniformly distributed to prepare the recycled aggregate cement concrete.
3. The method for preparing recycled aggregate cement concrete according to claim 2, wherein the preparation steps are as follows:
(1) Placing a 19mm standard sieve, a 16mm standard sieve, a 9.5mm standard sieve and a 4.75mm standard sieve from top to bottom to form a sieving tool, pouring the recycled aggregate into the 19mm standard sieve, placing the sieving tool on a vibrating sieve machine, starting the vibrating sieve machine to sieve the recycled aggregate to obtain the recycled aggregate with the particle size ranges of 4.75-9.5 mm, 9.5-16 mm and 16-19 mm;
(2) Placing 20 mass percent of recycled aggregate with the particle size of 4.75-9.5 mm, 60 mass percent of recycled aggregate with the particle size of 9.5-16 mm and 20 mass percent of recycled aggregate with the particle size of 16-19 mm into a 101-5B type electrothermal blowing dry box, and drying for 1h at the temperature of 100 +/-5 ℃;
(3) And (3) putting the natural sand into a 101-5B type electric heating air blast drying oven, and drying for 1h at the temperature of 100 +/-5 ℃.
4. The method for preparing recycled aggregate cement concrete according to claim 2, wherein the step of pretreating recycled aggregate is as follows:
(1) Handle according to 1m 3 The recycled aggregate cement concrete contains 180-120 kg of cementThe concrete stirrer is filled with the uniformly mixed recycled aggregate;
(2) Starting a stirrer to stir the mixture of the recycled aggregate and the cement at a rotating speed of 45r/min for 2min until the recycled aggregate and the cement are uniformly mixed;
(3) Handle according to 1m 3 Adding 32-48 kg of water contained in the recycled aggregate cement concrete into a concrete stirrer filled with a uniform mixture of recycled aggregate and cement;
(4) And starting a stirrer to stir the mixture of the recycled aggregate, the cement and the water at a rotating speed of 45r/min for 4min until the surface of the recycled aggregate is uniformly covered by the cement paste (3), so as to obtain the treated recycled aggregate (4).
5. The method for preparing recycled aggregate cement concrete according to claim 2, wherein the steps of preparing cement mortar are as follows:
(1) While the recycled aggregate is pretreated, the recycled aggregate is fed into another horizontal concrete mixer according to the proportion of 1m 3 Adding 595.95kg natural sand and 1m of the natural sand into the recycled aggregate cement concrete 3 Adding 400kg of cement into the recycled aggregate cement concrete;
(2) Starting a stirrer to stir at a rotating speed of 45r/min for 2min, and uniformly stirring the mixture of the natural sand and the cement;
(3) Will be in accordance with 1m 3 The recycled aggregate cement concrete contains 1kg of polycarboxylic acid water reducing agent and 1m 3 Pouring 160kg of water contained in the recycled aggregate cement concrete into a plastic container, stirring for 1min by using a glass rod until the water is uniformly mixed, and adding the polycarboxylic acid water reducing agent and the water mixture into a concrete stirrer filled with the uniform mixture of the natural sand and the cement;
(4) And starting a stirrer to stir at a rotating speed of 45r/min for 2min to prepare cement mortar (5).
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